The British Royal Family's surname is Windsor. They changed their name from Saxe-Coburg-Gotha to Windsor in 1917.

Why did they change their name?

World War One broke out in 1914 and anit-German sentiment was at its height in 1917. In protest, King George V renounced all the German titles belonging to him and his family and adopted the name of his castle, Windsor.

HM = Her Majesty
HRH = His of Her Royal Highness
TRH = Their Royal Highnesses

HM The Queen Elizabeth II

HRH The Duke of Edinburgh (The Queen's husband)

HRH The Prince of Wales and HRH The Duchess of Cornwall Prince Charles is the Queen's eldest son and his wife
(Charles Philip Arthur George; born 14 November 1948)

Prince Charles is known as "The Prince of Wales"
The title 'Prince of Wales' is given to the heir to the British throne. The tradition of investing the heir of the monarch of Britain with the title of "Prince of Wales" began in 1301, when King Edward I of England, having completed the conquest of Wales, gave the title to his heir, Prince Edward (later King Edward II of England).

HRH Prince William of Wales
(The Prince of Wales's elder son)

Prince William Arthur Philip Louis was born on 21 June 1982

HRH Prince Harry of Wales
(The Prince of Wales's younger son)

Prince Henry Charles Albert David (always known as Prince Harry) was born on 15 September 1984

HRH The Princess Royal (The Queen's daughter)
(Anne Elizabeth Alice Louise; born 15 August 1950 ) Princess Anne "The Princess Royal"
Princess Royal is a title customarily (but not automatically) awarded by a British monarch to his or her eldest daughter.

HRH The Duke of York
(Andrew Albert Christian Edward; born 19 February 1960)
Prince Andrew
is the third child and second son of Queen Elizabeth II.

Prince Andrew "The Duke of York"
Since the 15th century, the title 'Duke of York' has, when granted, been usually given to the second son of the British monarch. (Andrew has currently no male heirs, thus, the most likely candidates for the next "Duke of York" are Prince Harry of Wales, being the second son of Charles, Prince of Wales, or a second son of Prince William of Wales.)

The wife of the Duke of York is known as The Duchess of York .

TRH The Earl and Countess of Wessex (The Queen's youngest son and his wife)
(Edward Antony Richard Louis; born 10 March 1964)
Prince Edward
is the youngest child and third son of Queen Elizabeth II. He has held the title of Earl of Wessex since 1999.

Prince Edward, "The Earl of Wessex",
Younger sons of the monarch are normally given dukedoms at the time of their marriage. However, given the Prince's theatrical links and the Royal Family's policy of "slimming down" their size — and Edward's being seventh in the order of succession to the British throne, the Earldom of Wessex was recreated, Earl being a lesser title than Duke.

The region of Wessex (the "West Saxons'), in the south and southwest of England, was one of the seven major Anglo-Saxon kingdoms.

TRH The Duke and Duchess of Gloucester (The Queen's cousin and his wife)

TRH The Duke and Duchess of Kent (The Queen's cousin and his wife)

TRH Prince and Princess Michael of Kent (The Queen's cousin and his wife)

Diana, Princess of Wales was the first wife of Charles, Prince of Wales. Their sons, Princes William and Henry (Harry), are second and third in line to the thrones of the United Kingdom and fifteen other Commonwealth Realms.

On 31 August 1997, Diana died after a car crash in the Pont de l'Alma road tunnel in Paris along with Dodi Al-Fayed and the acting security manager of the Hôtel Ritz Paris,